Jason Schwartzman and Kristen Johnson found themselves together in a Chelsea S&M club last week. They were doing a scene for the HBO dark comedy “Bored to Death,” which films most of its footage in Brooklyn. The sitcom follows Schwartzman, a dejected writer-turned-private eye, as he takes on a different case each episode. The S&M club, packed with whips, chains and dog leashes, was the backdrop for the second-season premiere, where Schwartzman solves a mystery for a regular club patron.